Investigations on an adaptive Helmholtz resonator concept
Résumé
"Helmholtz resonators have been historically one of the first engineered concepts for acoustic control.
They can be used either for increasing sound at a specific frequency, or create antiresonances
depending on the way they are implemented. In terms of acoustic control for industrial applications,
they constitute very efficient solutions for tonal excitations with a fixed frequency. The
resonance frequency of the resonator has to be tuned on this frequency, meaning that if any change
occurs in the excitation frequency, the control is no longer possible with the resonator. The concept
proposed here to overcome this limitation consists in designing a Helmholtz resonator with a
variable volume, that can be controlled in real-time. On the basis of waterbomb origami design,
multiphysics simulations are performed to define the geometry of the adaptive cavity. After manufacturing,
experimental tests are used to validate the models and illustrate the efficiency of the
concept."
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